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中文摘要：
针对空间蒸汽压缩热泵系统中压缩机的润滑问题，对不依赖重力回油的汽车涡旋压缩机进行改变倾角的实验，研究重力方向对涡旋压缩机及热泵系统运行的影响。结果表明压缩机在0°～360°范围内改变角度时，热泵系统均能正常工作；当吸热量为2500～3500W时，蒸发温度最大变化量为1．3℃，蒸发冷凝温差以及热泵系统性能系数（COP）的最大变化量分别为3．2％和6．3％，重力无关性较好。压缩机的性能与循环油量有关，本实验中压缩机在倒置的角度下，沉积的润滑油与冷却剂一起进入热泵系统参与循环，使其性能略有提高。
英文摘要：
In order to investigate the effect of gravity direction on the compressor lubrication of space vapor compression heat pump, the experiments for the scroll compressor with various inclination angle have been done in this paper. The results show that the heat pump system can keep working well in all inclination angles, and the gravity independence of scroll compressor is well. In the cooling power of 2500 - 3500 W, the maximum variation of evaporation temperature is 1.3℃. The maximum relative change in the temperature difference between evaporation and condensation and coefficient of performance （COP） are 3.2% and 6.3% respectively. The performance of the compressor is associated with quantity of circulating oil. When the compressor is inversed in these experiments, settled lubrication oil circulates together with the refrigerant through the heat pump system, thus improving the performance of compressor.
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